US2198278A - Apparatus for measuring accelerations and retardations - Google Patents

Apparatus for measuring accelerations and retardations Download PDF

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Publication number
US2198278A
US2198278A US197500A US19750038A US2198278A US 2198278 A US2198278 A US 2198278A US 197500 A US197500 A US 197500A US 19750038 A US19750038 A US 19750038A US 2198278 A US2198278 A US 2198278A
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United States
Prior art keywords
pendulum
shaft
slot
retardations
pitch
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Expired - Lifetime
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US197500A
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English (en)
Inventor
Gerard Willem Peter Van Heiden
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Individual
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Individual
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/03—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means
    • G01P15/032—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means by measuring the displacement of a movable inertial mass

Definitions

  • the present invention relates to apparatus for 1 measuring accelerations and retardations and more particularly to those arranged in vehicles for recording the brake-capacity or the road-re slstance. v Many apparatus are known for indicating the said values.
  • the apparatus according to the invention is characterized by the provision of a pendulum suspended without friction by two horizontal arms, ground in the form of a chisel, which when oscillating from its gravity-equilibrium position eiieeis the rotation of a shaft carrying an indicater and comprising a. regulating surface, rea senihlinga twisted strip; r
  • This apparatus may be mounted as an auxiliary device in the instrument panel, particularly for the benefit oi car-users, who appreciate being able to determine at any moment the condition l0 0! the brakes or the adhesion between the tire and the road.
  • a portable device, not permanent- 1y mounted in a car. may serve for brake testing by police, traiilc-inspection and for use by cardealers.
  • the apparatus can also serve for the II, Purpose oi. determining the road-resistance of a car, e. g., for the determination of the air-resistance at diflerent speeds of cars, locomotives, I
  • an oscillation damper will 39 be applied.
  • the dial plate it is possible to take into account the bending of the front-springs of the vehicle and the release of the rear-springs during the use of the V brakes. As to this end an average value is is taken, the indication for cars with large wheel base and still springs is a few percent too small, and for cars with small wheel base and slack springs a fewpercent too large.
  • Fig. 1 shows a front view 01' a portable brake testing apparatus according to the invention.
  • Fig. 2 is a back view of the same with the casing opened.
  • Fig. 3 shows a horizontal section through the apparatus taken on section line III-III of Fig. 1.
  • Fig. 4 shows a vertical section taken on section line EV-JV oif-Flg. 2.
  • Fig. 5 shows a vertical sectional view taken on the section line V-V of Fig. 2.
  • Fig. 6 is a partview of an apparatus, similar to that shownin previous figures, but intended to be mounted in the instrument panel.
  • Fig. 7 shows a vertical sectional view taken on the section line VII-VII of Fig. 9 and in which the apparatus is shown mounted on a' vertical instrument panel, the pendulum weight heingdisposed on the outer end of the screw.
  • Fig: 8 shows a vertical sectional view taken on section line VII-VII of Fig. 10 but with the apparatus shown as mounted'in a slanting instrument panel and by screwing back the pendulum weight on the screw the pendulum, part with the slot is disposed perpendicular to the torsion shaft or in other words the indicator isagain set on zero.
  • Fig.9 is a sectional view taken on the section line IX-IX of Fig. 7 showing the form of the frame l2 and the penduluml',
  • the pendulum In the casing iin the first place is arranged the main part of the apparatus, to wit: the pendulum, consisting of the-arm 2 with the pen- .dulum weisht amounted on it.
  • the arm COIL convenient oscillations of the .indicator and consequently enables the apparatus to be read easily and avoids the possibility of obtaining temporarily too high indications.
  • the pendulum arm 2 comprises a slot III, in which a torsion shaft H,
  • This shaft is supported by the plate 'l and front plate I! of the apparatus.
  • an indicator I4 is mounted behind the glass plate IS.
  • An indicator I4 is mounted.
  • -- A scale is carried by a'plate Ii
  • the portable apparatus is mounted in a U-' shaped plate 24, which is placed against the windshield or the-instrument panel by means of rubber suction caps.
  • the ftorsion-shaftcannot" be obtained by simply twisting a strip. It may be true that the ap ratus could work with such atwisted strip, but as the straight lines in the helical surfaces arealways at right anglesto the torsion-shaft,
  • the pendulum would stick in case of even a small displacement from the zero-position, when the g9 slot fits accurately round, the shaft-which is of.
  • m comprising for instance, a' steel central wire about which .two metal wires, e. g., of brass of the'same thickness, have been wound.
  • the pitch of the helical lines diflers with the distance of the brass wires from centre to centre over a length of the shaft equal to the distance of the steel shaft to the suspension point of the pendulum.
  • the helical thread which always occupies the lowermost position in the slot of the pendulum, has the larger pitch.
  • suction caps are connected to a U-shaped frame 0 :-plate 24, towhich the casing of the apparatus 1 is pivotally connected.
  • the wing nut I8 makes it possible to adjust the instrument for any angle of the glass or instrument panel into the vertical position in which the pointer is at zero. 15
  • the pendulum In the case of an apparatus which is to be permanently mounted, the angular position of the casing cannot be changed.
  • the pendulum In order to be able to adjust the pointer nevertheless to zero, the pendulum is constructed in two pieces which are 20 adjusted with regard to each other in such a way that the slot in the pendulum is at right angles to the torsion-shaft whenwthe pendulum weight is vertically below the suspension point.
  • the pendulum 26 weight 23 can be adjusted on the screw 22, whereas the torsion-shaft H passes through the pendulumarm 2 at the other side of it.
  • retar dations comprising a freely suspended pendulum having a slot therein, a shaft member mounted for rotation about its longitudinal axis and carrying an indicating'elemenh helical eled0 ments carried .by said. shaft and engaging the pendulum slot, the portion of the helixengaging the slot at an inner radial point from the pen-.- dulum,pivot is formed with a less pitch than the portion of said helical element contacting as :theslot at a radially outer portion thereof from the pivotalaxis of the pendulum. .1
  • said part is arranged to work in the slot so that the point of the wire helix of larger pitch engaged by the slot in any given position of the

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
US197500A 1937-03-25 1938-03-22 Apparatus for measuring accelerations and retardations Expired - Lifetime US2198278A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2198278X 1937-03-25

Publications (1)

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US2198278A true US2198278A (en) 1940-04-23

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US (1) US2198278A (enrdf_load_stackoverflow)
NL (1) NL47952C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003241A (en) * 1974-07-19 1977-01-18 General Electric Company Accelerometer method of indicating rolling resistance of a vehicle
US4387587A (en) * 1981-06-17 1983-06-14 Faulconer Boyd M Motor vehicle deceleration data acquisition and processing apparatus and methodology
US4672838A (en) * 1984-01-19 1987-06-16 General Dynamics, Pomona Division Bearing friction tester
US5295387A (en) * 1992-03-23 1994-03-22 Delco Electronics Corp. Active resistor trimming of accelerometer circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003241A (en) * 1974-07-19 1977-01-18 General Electric Company Accelerometer method of indicating rolling resistance of a vehicle
US4387587A (en) * 1981-06-17 1983-06-14 Faulconer Boyd M Motor vehicle deceleration data acquisition and processing apparatus and methodology
US4672838A (en) * 1984-01-19 1987-06-16 General Dynamics, Pomona Division Bearing friction tester
US5295387A (en) * 1992-03-23 1994-03-22 Delco Electronics Corp. Active resistor trimming of accelerometer circuit

Also Published As

Publication number Publication date
NL47952C (enrdf_load_stackoverflow)

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